<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>dom渲染任务</title>
    <!--这里必须等script脚本运行加载完毕才能解析下面的dom-->
    <!-- <script src="./4.js"></script> -->
</head>
<body>
    <h1>dom</h1>
</body>
<script src="./4.js"></script>
</html>